Harmless to humans and pets: the mole repellent pulses every 30 seconds and emits acoustic pulses and vibrations from 400 Hz-1000 Hz. This stimulates the rat's central nervous system to repel animals such as mice, moles, field mice and ground squirrels. The field mouse repels rats without hurting them and is safe for the environment, people and animals. Solar energy: mole-resistant built-in high-tech solar panel, can be charged directly by solar energy, no extra batteries needed, saves lots of energy, practical and environmentally friendly. The Mollenverjager can work continuously for 5-7 days, with a full charge only 8 hours in the sun to guarantee normal work on rainy or cloudy days. Safety material: mouse repellent made of high quality ABS and IP65 waterproof and corrosion resistant , and will not pollute the floor even after prolonged work. The column protection can be worked deeper and more firmly into the ground. The green outer cover is easy to hide in plants and you can also attach the repeller to a branch to gently scare birds away without harming them. Effective range: The effective range of the solar-powered ultrasonic mole repeller is a circle with a radius of approximately 15 meters and the effective range is 650 square meters. This product is suitable for open lawns, parks, farms, gardens and other open spaces. For the best results, we recommend installing 1-2 devices per 30 meters in areas where moles are common. Waterproof and durable: the mole repeller is made of high-quality ABS and PVC materials, it does not corrode not easy if it is placed outside for a long time. Do worry about an animal repellent device for use in the rain.